Journal of Materials Chemistry A
·
2024
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IF 10.7
Chuhan Huang,Tianqin Huang,Xue Liang Li,Wei Zhou,Meng Ding
Two-dimensional transition metal carbides/nitrides (MXenes) have gained considerable prominence in capacitive deionization (CDI) due to their exceptional electrochemical activity and outstanding electronic conductivity. However, the further development of MXenes in practical applications in CDI is hampered by their limited narrow interlayer spacing and oxidation proneness. Herein, a dual-functional surface modification of Ti3C2Tx MXene by sodium ascorbate (SA) is proposed to concurrently enhance the salt adsorption capacity and long-term stability. The modification by SA induces synergistic functions, including the enlargement of interlayer spacing, effective protection of Ti from oxidation, and exceptional electrical conductivity. Simultaneously, this film electrode is designed to be flexible and free-standing, devoid of binders or adhesives, showing promise for the large-scale production of CDI electrodes. Benefiting from these advantages, the SA-modified MXene exhibit excellent desalination performance, including high salt adsorption capacity (109.6 mg g−1), high salt adsorption rates (17.5 mg g−1 min−1), and impressive cycling stability (100% retention after 80 cycles). And the adsorption behavior of SA-modified MXenes is further investigated by in situ X-ray diffraction and density functional theory calculations. This work proposes an effective modification and explores theoretical aspects for fabricating MXene-based electrodes suitable for CDI and other electrochemical applications in moist or aqueous environments.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xuechun Wang,Yanxiang Sang,Hongjie Zhang,Benyan Zheng,Bibo Wang,Yuan Hu,Ruiying Wu
As a wound management strategy, this study developed a nanocomposite hydrogel based on the photothermal therapy and photodynamic therapy of nanomaterials, as well as the effects of Bletilla striata polysaccharide (BSP). In this research, MXene nanosheets loaded with indocyanine green were embedded into a hydrogel doped with BSP. By combining the photothermal effect and photodynamic effect, the treatment of wounds infected with Staphylococcus aureus was achieved under 808 nm near-infrared light irradiation (NIR). The characterization results of the hydrogel showed that it had good adhesiveness with an adhesive strength of 629 KPa ± 15.52 KPa and excellent biocompatibility; the swelling rate after 48 h was 485.53 % ± 0.26 %. In terms of antibacterial performance, the hydrogel had an antibacterial rate of over 90 % against Staphylococcus aureus . In addition, it could significantly promote the deposition of collagen and angiogenesis in infected wounds. When applied to wound treatment, the wound closure rate reached 98 % after 14 days, the collagen fraction of the healed wound was 87.63 % ± 1.81 %, and the epidermis thickness was 130.33 μm ± 1.25 μm. This indicated that the nanocomposite hydrogel dressing could effectively promote wound healing.
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SOLAR ENERGY
·
2021
·
IF 5.742
Xiaobo Chen,Yefei Zhuang,Qingyu Shen,Xiaoyu Cao,Wen Yang,Peizhi Yang
Low electrocatalytic activity and/or high charge transfer resistance of counter electrodes (CEs) in quantum-dot-sensitized solar cells (QDSSCs) are the main reasons for the low photovoltaic performance . Herein, the CoS nanoparticles are anchored on the MXene (Ti 3 C 2 T x ) via a simple in-situ hydrothermal reaction process. It is the first attempt to use the MXene/CoS as a highly electrocatalytic CE for QDSSCs . The QDSSCs with a MXene/CoS CE shows a significant enhancement in cell performances and yields a promising power conversion efficiency (PCE) of 8.09% compared with that of the QDSSCs with bare CoS (5.77%) and bare MXene (4.25%) CEs. The significant enhancement of PCE value is mainly attributed to the synergistic effects of the unique layered morphology of conductive MXene nanosheets and its cocatalysis with CoS nanoparticles. The coupling of layered MXene with small CoS nanoparticles (~15 nm) provides abundant catalytic active sites. The improved mesoporous morphology contributes a high specific surface area and fast electron transfer channels for S x 2− reduction. Consequently, the MXene/CoS nanocomposite can be utilized as an effective agent to boost up the photovoltaic performance of QDSSCs.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 32
·17390-17399
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IF 12.732
Tianshi Zhao,Chenguang Liu,Chun Zhao,Wangying Xu,Yina Liu,Ivona Z. Mitrovic,Eng Gee Lim,Li Yang,Ce Zhou Zhao
MXenes are a large class of two-dimensional (2D) materials widely studied recently since they have good water solubility and are able to tune the work function (WF) of materials without changing their electronic characteristics. Based on this, aqueous solution-processed indium-free zinc tin oxide (ZTO) thin-film transistors (TFTs) have been fabricated under an annealing temperature of 300 °C and successfully optimized. This optimization is achieved by fabricating a channel layer into a homojunction structure (MXene doped ZTO/ZTO) to form a two-dimensional electron gas (2DEG). Through doping the specific concentrations of Ti3C2Tx MXenes into the upper layer ZTO thin films, the TFTs exhibit enhanced field-effect mobilities (μFE) of 10.77 cm2 V−1 s−1 and 13.06 cm2 V−1 s−1 as well as a large on/off current ratio of more than 108. Moreover, compared with the undoped double-layer ZTO TFTs, the homojunction devices show better stability, mainly resulting from the transformation in leading conduction mode. Finally, through applying the homojunction channel on the solution-processed aluminum oxide (AlOx) dielectric layer, the μFE exhibits a further enhanced value of 28.35 cm2 V−1 s−1. This is the first report to apply MXenes to the channel layer of TFTs and to fabricate solution-processed ZTO thin films via an aqueous solvent under 300 °C.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 24
·2010987
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IF 18.808
Di Yang,Chunyu Zhao,Ruqian Lian,Lin Yang,Yizhan Wang,Yu Gao,Xu Xiao,Yury Gogotsi,Xudong Wang,Gang Chen,Yingjin Wei
The propensity of Li to form irregular and nonplanar electrodeposits has become a fundamental barrier for fabricating Li metal batteries. Here, a planar, dendrite-free Li metal growth on 2D Ti 3 C 2 T x MXene is reported. Ab initio calculations suggest that Li forms a hexagonal close-packed ( hcp ) layer on the surface of Ti 3 C 2 T x via ionic bonding and the lattice confinement. The ionic bonding weakens gradually after a few monolayers, resulting in a nanometers-thin transition region of hcp -Li. Above this transition region, the deposition is dominated by plating of body-centered cubic ( bcc ) Li via metallic bonding. Formation of a dense and planar Li metal anode with preferential growth along the (110) facet is explained by the lattice matching between Ti 3 C 2 T x and hcp -Li and then with bcc -Li, as well as preferred thermodynamic factors including the large dendrite formation energy and small migration barrier for Li. The prepared Li metal anode shows stable cycling in a wide current density range from 0.5 to 10.0 mA cm –2 . The LiFePO 4 ‖Li full cell fabricated with this Li metal anode exhibits only 9.5% capacity fading after 500 charge–discharge cycles at 1 C rate.
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Analytical Methods
·
2023
·Vol. 15
·期 10
·1336-1344
·
IF 3.1
Yuling Jiang,Miao Yang,Mingyao Yu,Lingling Huang,Yue Ke,Lei Yang
Herein, a simple and highly sensitive electrochemical sandwich-like immunosensor for the squamous cell carcinoma antigen (SCCA) was constructed using gold nanoparticle/graphene nanosheet (Au/GN) nanohybrids as a sensing platform and β-cyclodextrin/Ti3C2Tx MXenes (β-CD/Ti3C2Tx) as a signal amplifier. The good biocompatibility and large surface area as well as the high conductivity of Au/GN allow the platform to load primary antibodies (Ab1) and facilitate electron transport. In the case of the β-CD/Ti3C2Tx nanohybrids, the β-CD molecule is dedicated to binding secondary antibodies (Ab2) through host–guest interactions, thus inducing the formation of the sandwich-like structure Ab2-β-CD/Ti3C2Tx/SCCA/Ab1/Au/GN in the presence of SCCA. Interestingly, Cu2+ can be adsorbed and self-reduced on the surface of the sandwich-like structure to form Cu0 since Ti3C2Tx MXenes can exhibit superior adsorption and reduction capabilities towards Cu2+, and a prominent current signal of Cu0 can be observed via differential pulse voltammetry. Based on this principle, an innovative signal amplification strategy has been proposed for SCCA detection, which avoids the process of labeling the probe and the specific immobilization step of catalytic components on the surface of amplification markers. After the optimization of various conditions, a wide linear range from 0.05 pg mL−1 to 20.0 ng mL−1, coupled with a low detection limit of 0.01 pg mL−1, was obtained for SCCA analysis. The proposed method for SCCA detection was also applied in real human serum samples and the observed results are satisfactory. This work opens up new pathways for constructing electrochemical sandwich-like immunosensors for SCCA and other targets.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Zhengyan Chen,Maoyu Zhang,Zhengzheng Guo,Hongtao Chen,Hongxia Yan,Fang Ren,Yanling Jin,Zhenfeng Sun,Penggang Ren
Despite two-dimensional (2D) layered MoS 2 and newly emerging lamellar MXene providing great potential in lubricity, the mechanical and tribological performance of their hybrids in polymeric composites has been rarely discussed. Herein, the Ti 3 C 2 T x MXene/MoS 2 hybrids were successfully prepared by a hydrothermal method , and a novel hyperbranched polysiloxane (HBPSi) terminated by amino groups was synthesized by a one-pot polycondensation reaction. The mechanical and tribological properties of bismaleimide (BMI) composites as well as their wear mechanisms were systematically evaluated using HBPSi as reinforced phase and MXene/MoS 2 as lubrication additive. The results show that the addition of HBPSi and MXene/MoS 2 hybrids dramatically improved mechanical strengths and tribological performance . Specifically, the 8 wt% HBPSi and 0.6 wt% MXene/MoS 2 hybrid filler enhanced impact and flexural strengths by 85% and 42%, and decreased the frictional coefficient and wear rate by 69% and 88%, respectively, with neat BMI resin as a comparison. The splendid mechanical and tribological performance is ascribed to the synergistic effect of “soft” toughening HBPSi and “hard” lubricating MXene/MoS 2 , the good dispersion of hybrid filler , and the formed protective tribo-film. This work paves a way for the design and application of novel high-performance lubrication additive in the polymeric matrix .
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yijin Wang,Junli Nie,Zhang He,Yuanhong Zhi,Xiaohua Ma,Peng Zhong
Solar-driven interface evaporation recently emerges as one of the most promising methods for seawater desalination and wastewater purification, mainly due to its low energy consumption. However, there still exist special issues in the present material system based on conventional noble metals or two-dimensional (2D) nanomaterials etc., such as high costs, low light-to-heat conversion efficiencies, and unideal channels for water transport. Herein, a composite photothermal membrane based on Ti3C2Tx MXene nanoflakes/copper indium selenide (CIS) nanoparticles is reported for highly efficient solar-driven interface evaporation toward water treatment applications. Results indicate that the introduction of CIS improves the spatial accessibility of the membrane by increasing the interlayer spacings and wettability of MXene nanoflakes and enhances light absorption capability as well as reduces reflection for the photothermal membrane. Simultaneously, utilization of the MXene/CIS composite membrane improves the efficiency of light-to-heat conversion probably due to formation of a Schottky junction between MXene and CIS. The highest water evaporation rate of 1.434 kgm–2 h–1 and a maximum water evaporation efficiency of 90.04% as well as a considerable cost-effectiveness of 62.35 g h–1/$ are achieved by using the MXene/CIS composite membrane for solar interface evaporation, which also exhibits excellent durability and light intensity adaptability. In addition, the composite photothermal membrane shows excellent impurity removal ability, e.g., >98% for salt ions, >99.8% for heavy metal ions, and ∼100% for dyes molecules. This work paves a promising avenue for the practical application of MXene in the field of water treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Man Qi,Fan Li,Zheng Zhang,Qiao Lai,Yuwen Liu,Jianmin Gu,Liqiu Wang
Aqueous zinc-ion batteries (ZIBs) are receiving a continuously increasing attention for the flexible and wearable electronics, due to their non-toxicity, non-flammability, and low-cost features. The development of high-performance flexible cathodes is of great significance to the development of flexible ZIBs. In this work, the flexible electrode of three-dimensional (3D) interconnected ultrathin MnO 2 nanosheets on carbon cloth (CC@MnO 2 ) coated with Ti 3 C 2 T x MXene (CC@MnO 2 @MXene) is prepared by electrodeposition and dipping methods, in which CC@MnO 2 is put into MXene dispersion for impregnation treatment to make the CC@MnO 2 fibers wrapped with MXene completely. The results show that the coating of MXene improves the conductivity of the composite, and the interface between MXene and MnO 2 provides more active sites. Therefore, CC@MnO 2 @MXene-10 electrode as the cathode of zinc ion battery provides high charge storage performance (517.0 mAh g −1 at 0.1 A g −1 ), excellent cycling stability (80.6 mAh g −1 after 800 cycles at 1 A g −1 ) and excellent energy density (701.3 Wh kg −1 at 133.8 W kg −1 ). Finally, flexible quasi-solid battery based on CC@MnO 2 @MXene composite as cathode was assembled, and the flexible electrodes show potential for application.
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Yanli Li,Bing Zhou,Yong Shen,Chengen He,Bo Wang,Chuntai Liu,Yuezhan Feng,Changyu Shen
The durability and large-scale production of Ti 3 C 2 T x MXene-based composites are the main obstacles in industrialized application. Herein, a scalable blade coating method is demonstrated for fabricating the flexible and durable polyvinylidene fluoride (PVDF)/Ti 3 C 2 T x MXene layered films with compact hierarchical brick-and-mortar structure. The highly aligned MXene nanosheets make the obtained PVDF/MXene films with high electrical conductivity from 21.1 to 214.6 S cm −1 . In combination to the multiple wave reflection in hierarchical layered structure and the interfacial polarization between dielectric matrix and MXene, PVDF/MXene films reveal excellent electromagnetic interference (EMI) performance with an optimal specific EMI shielding effectiveness (SSE/t) of 19504.8 dB cm 2 g −1 at only 17 μm thickness. More importantly, the PVDF/MXene film can withstand the damages from mechanical deformation , hot/cold attack and chemical corrosion, meanwhile maintain a stable EMI shielding performance within floating of 5%. Besides, arising from the surface plasmon resonance effect and high electrical conductivity, the PVDF/MXene film reveals photo/electro-thermal heating abilities with rapid response time, high stability and controllability, which ensure their reliable EMI shielding performance under extremely cold conditions.
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ChemElectroChem
·
2020
·Vol. 7
·期 24
·4922-4930
·
IF 4.154
Hao Wang,Ruixin Zheng,Chaozhu Shu,Jianping Long
Graphical Oxygen vacancy-enriched TiO 2 nanoparticles grown in situ on Ti 3 C 2 T x MXene enhance CO 2 adsorption and Li 2 CO 3 decomposition, thereby remarkably facilitating CO 2 involved electrode reactions for overall Li-CO 2 batteries. Lithium-carbon dioxide (Li-CO 2 ) batteries are considered as a most auspicious energy storage systems owing to their high capacity and the ability of capturing CO 2 . However, there are still some critical issues needed to be addressed before their practical application, such as high charge potential and poor cyclability. Herein, oxygen vacancy-enriched TiO 2 nanoparticles grown in situ on Ti 3 C 2 T x MXene (O V -TiO 2 /MXene) are synthesized as catalysts for Li-CO 2 batteries by facile one-step ethanol heat treatment of the MXene nanosheets. The thermodynamically metastable Ti atom on the surface of MXenes serves as nucleating sites, which play a critical role in generating the relatively stable vacancy-rich TiO 2 nanoparticles. The spontaneously generated oxygen vacancies can enhance CO 2 adsorption, which is beneficial to CO 2 involved electrode reactions. The Li-CO 2 batteries with O V -TiO 2 /MXene electrodes deliver noteworthily reduced charge voltage of 3.37 V at 100 mA g −1 , and a superb cycling performance of 158 cycles. This work highlights the significant role of oxygen vacancies in activating CO 2 in Li-CO 2 batteries, instrumental to the development of high-performance electrocatalysts for Li-CO 2 batteries and beyond.
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COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Qinhua Wang,Xiaofeng Pan,Xinpin Wang,Haili Gao,Yongbiao Chen,Lei Chen,Yonghao Ni,Shilin Cao,Xiaojuan Ma
The restacking tendency of 2D Ti 3 C 2 T X (MXene) sheets is the main obstacle preventing their application as functional materials in hydrogel. Herein, we fabricated novel ultra-stable 3D MXene-polyacrylamide (PAM) nanocomposite hydrogels inspired by the structure of a spider web . In particular, MXene nanosheets were uniformly located in a gel medium by precise alignment of sonication treatments, followed by the in-situ self-assembly of PAM hydrogel. In this instance, the MXene nanosheets are well-confined and trapped ( via strong interactions) by the interwoven spider web-like structure of the PAM chains, which grow in-situ on the surface of the nanosheets. This approach proved effective to solve problems associated with the poor stability of MXene nanosheets in the hydrogel; more prominently, the tight cross-linked structure endows the MXene-PAM hydrogel with anti-compressive and anti-swelling capabilities; the continuous distribution of MXene nanosheets connected by the PAM network creates electron transport pathways and proton transport bridges in the hydrogel. Therefore, the hydrogel can be employed as a temperature and strain sensor or as a component of moist-electric nanogenerator.
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